On Tue, 12 Jun 2012 15:34:32 -0400, Josh Boyer wrote:
> Hi,
>
> I've been poking around at the libhugetlbfs testcases and there are a
> small number of failures that I can't figure out. The primary one is
> the malloc test. From all appearances, it seems that the custom
> hugetlbfs_morecore function isn't getting called when the test calls
> malloc, and it fails because the page wasn't allocated from the
> hugepages. You can see below that the INFO call in the
> hugetlbfs_morecore function never prints anything:
>
> [jwboyer@zod obj64]$ sudo
> LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:../../obj64/
> LD_PRELOAD=../../obj64/libhugetlbfs.so HUGETLB_MORECORE=yes
> HUGETLB_VERBOSE=4 ./malloc
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Found pagesize 2048 kB
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Parsed kernel version:
> [3] . [3] . [7]
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Feature
> private_reservations is present in this kernel
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Feature noreserve_safe
> is present in this kernel
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Feature map_hugetlb is
> present in this kernel
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Kernel has MAP_PRIVATE
> reservations. Disabling heap prefaulting.
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: Kernel supports
> MAP_HUGETLB
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: HUGETLB_SHARE=0,
> sharing disabled
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: HUGETLB_NO_RESERVE=no,
> reservations enabled
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: No segments were
> appropriate for remapping
> libhugetlbfs [zod.bos.redhat.com:22061]: INFO: setup_morecore():
> heapaddr = 0xe00000
> Starting testcase "./malloc", pid 22061
> HUGETLB_MORECORE=yes
> HUGETLB_RESTRICT_EXE=(null)
> expect_hugepage=1
> malloc(4) = 0xd89010
> FAIL Address is not hugepage
> [jwboyer@zod obj64]$
>
> This is with the latest git head of libhugetlbfs, and I have 32
> hugepages setup and free:
>
> [jwboyer@zod glibc]$ grep Huge /proc/meminfo
> AnonHugePages: 299008 kB
> HugePages_Total: 32
> HugePages_Free: 32
> HugePages_Rsvd: 0
> HugePages_Surp: 0
> Hugepagesize: 2048 kB
> [jwboyer@zod glibc]$
>
> I ran the test in gdb as well, and my breakpoint on
> hugetlbfs_morecore
> never triggered after main was started. Perhaps this is a
> side-effect
> of glibc already having pre-allocated heap from arenas?
>
> Has anyone else seen this?
>
> josh
Quick question, do you have hugetlbfs mounted?
Eric
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